<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>login</title>
</head>
<body>
  <form action="http://localhost:8080/authentication" method="POST">
    <div>
      <label for="username">Username</label>
      <input type="text" id="username" name="username" value="user1" />
    </div>
    <div>
      <label for="password">Password</label>
      <input type="text" id="password" name="password" value="123" />
    </div>
    <input type="hidden" name="clientId" value="client1" />
    <div>
      <button type="submit">Login</button>
    </div>
  </form>
</body>
</html>